The way of playing this app is to find which cells in a grid must be colored or left blank according to numbers and quotation marks in them. Then you end up finding out a hidden pixel art.

You see a number and quotation marks in a cell in the grid. Those are clues to paint which cells and with what color.
For example a clue of 4'' means there are four cells that you need to paint and those four cells are painted in two colors.